Manual:$wgExternalStores

Content handlers and storage: $wgExternalStores
List of enabled ExternalStore protocols.
Introduced in version:1.4.5
Removed in version:still in use
Allowed values:Unspecified
Default value:[] (1.23+)
false (1.4.5-1.22)

Details edit

List of enabled ExternalStore protocols.

$wgExternalStores = [ "DB" ];
  Caution: Access to database might lead to code execution.

See also edit